I have heard and was told that when clown's do this sort of thing, they are being harassed. What other types of fish do u have? My did the same thing when I put um in. I had some azure damsels that are like little kids teasing them or just trying to show them that there not wanted. After a while they settled down, but they stayed the opposite side of the tank for the remainder of there life. Give it some time, it should get better

Im not sure about the behavior habbits of the goby does it have an attitude? And my experience with chromis is that they are shy and peaceful, but then again, they're in the damsel family. I would say get some more LR to give your clown more places to hide, other than that only time will tell